Justin Bieber fans cause chaos in Oslo
The singer's announcement that he would perform six songs at an outdoor gig in Oslo sent his Norwegian fans into a frenzy.
And the authorities threatened to declare a state of emergency as thousands of kids descended on the city.
Hordes of screaming girls turned up to sit on rooftops and queue on walkways to watch the Baby singer strut his stuff at the Opera House.
And a flotilla of small boats crowded the harbour, each one packed to near-sinking level with teenagers.
In a moment of madness, crowds of girls raced across a busy road as the singer and his entourage left to go to a nearby restaurant.
Security guards watched helplessly as the reckless girls forced traffic at a city junction to a halt as they sprinted after the star's two black cars.
SCREAMING fans chase after teen idol Justin Bieber in capital Oslo
The singer was forced to plead for calm after police threatened to cancel the show, part of Justin's Around The World TV Special.
Emotional ... crying fans wait for show
He tweeted: "Norway - please listen to the police. I don't want anyone getting hurt. I want everything to go to plan but your safety must come first...for the show to happen you must all listen to the police.
"We are all concerned for your safety and I want what is best for you. please listen and tonight we will have some fun. Love you and I'm excited to see you all."
Floating devotees ... fans crowd the harbour
Manager Scooter Braun also took to Twitter to repeat the message.
He said: "The streets are filled. The bridges are closed. It is out of control. We may have to start the show early or they will cancel."
The event did go on as planned, and the teen pin-up treated the waiting crowd to four of his hits and two new tracks – All Around The World and As Long As You Love Me.
There's no doubt they do, Justin.
Pulling a crowd ... Justin Bieber fans gather outside Opera House
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